Conclusions
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1.
Nitriding of titanium steels in ammonia induces the formation of diffusion coatings whose properties depend on the ratio of titanium to carbon.
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2.
The best results are obtained for steels with Ti/C=6.5–9.5. The case on these steels is not brittle and has good adherence to the base metal.
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3.
With Ti/C>9.5 the case is brittle and easily broken due to the precipitation of high-nitrogen phase in the grain boundaries and slip planes, and also the diffusion of hydrogen.
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4.
The case depth varies exponentially with the nitriding temperature and parabolically with the nitriding time at all temperatures and ratios of titanium to carbon investigated.
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Literature cited
T. Konkoly, Wissenschaftliche Zeitschrift der Hochschule fur Schwermaschinenbau, Magdeburg, 2, No. 2/3 (1959).
T. Konkoly, Periodica Polytechnica, Engineering-Maschinen-und-Bauwesen, Budapest, 5, No. 1 (1961)
Kusako Kunio, Tokusyuko, Special Steel, 12, No. 4 (1963).
Yadzima Etsudziro, Furasawa Koiti, The Japan Inst. of Metals, 26, No. 6 (1962).
D. F. Comstock, Titanium in Cast Iron and Steel [Russian translation], IL (1956).
Additional information
Moscow Highway Institute. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 2, pp. 15–19, February, 1971.
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Lakhtin, Y.M., Lebedeva, G.V. Nitriding of steels containing titanium. Met Sci Heat Treat 13, 103–106 (1971). https://doi.org/10.1007/BF00650922
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DOI: https://doi.org/10.1007/BF00650922